What to see in Ireland in early September?

Hi All, I will be in Ireland for a week in early September. I will be in Belfast (Dungiven) for a day or two to see relatives, but what else should I see and do as a priority? If I went anti-clockwise from Belfast to Dublin what should I take in? (P.S. I will look to hire a car.) Thanks

Since neither of your identical posts have outlined your interests my only recommendation is to buy a guide book.